Electrical switch.



A. A. TIHRILL.

ELECTRICAL SWITCH.

APPLlcATloN FILED MAR. 28. |9x2.

A Pzlend Nov., 2, 1915.

Wl a lill/lf |11 of the switch along the ue ALLEE? Sveeif certi on of e,single recproceble pue A fin-teef oegecc- 1S to provlf indicate? for n,snap swch that is mounted but is actuefied bj ehem. The imei-cutermechanism isyfor mt weeen, siren@ (imvlable and ehnde, mld permits oi.mgy cempacfc am Lche smes.

My mvelmon 1s @ement of the Lomule e h is Side and sectional 'View odidF-t is constructed in accordance h 'th j y. 2 is face or plum View #neewfzch Fig. l? some of the perm being; broken e-Wdy for tie sake ofdeafness of i'usn'eod EA is e Side and seeticm' vie f of Dwice L ofFig', edeng nhe il'le 2. l. a Simier View V-XV. 5 is paf-iai *ohm m.'face View, showing parte that are broken aww in' 2. is e side andseobf'm View' of e 4 modceen of the ndiceo met is used in conn etica'with `he efoh, @ne Fig. 7 is a face View of a part of the eweh showingthe said ndica'fbof;

The operating parte of the switch are aflcarried by e frame 1.4, cowhich is seemed e fl'ont plae 2 that covers 'Ehe switch and the recessin ehe Well provided forthe reception. thereof. The frame 'i comprises ethat extends parallel 'to the zont plete and the intermediate portionwhich ie spaced somewhat from 'the p'ete oy having; its end portionssuitably bent. Tt efso provided n 3, pel-pum x on: the one@ and le lccopen opposite side; eo'f. one bei' p'ofexzdw/ fomed i1' nl with the has@and the other oclug attached 'ldereto U 5 me provided m'bewm'ee for thenew' their it" -c mds with reception of P, ./mf'. 2 tm; f 'between andboyoi'xd the o the LS here m slm provided 0n? de- Secured zo powde edouble @rech a, o enen end 'ma a. quick or cez'omiee en uctoacing everl2 carrying; a boeten 13 that projects; through, apertures in the frame1 and 'the plete 2. The Seid le er pvote'a or ldcnmcd a ete'ie of *heposi; 4k, ies-pivotal axis k quite 'enoe {con} he axis ef the she..I T,so ihm; .me nearys'reght line moveaem'; of opeirfnfbn button, and

i@ l ody moulded, upon the e, eyeing lfthati is secured@ second aiceeledesion 17 of engeges the vee? end of the pawl the couoe function ofnrmallv .he 12 and the button 13 in the posuons shown end ofmaintaining' the hooked end of he pew in elgagement with e. mchetv 18.elThe. said mchet is mounted upon one 'end of a, Short Isleeve 19 thatis., in euro, ocsely mounted upon the Sheff, i', en eeceninc '2G- beingmounted upon- ,o WVM new be described, "and whichA of which is securedto the sleeve, or to one ot the parts carried thereby. The other end ofthe spring engages a lateral boss or extenF sion 22 on a cam plate 23that is rigidly' secured to the shaft, the spring serving to opposerelative movement of the cam plate and the ratchet 18 and to rapidlyrotate the cam plate and shaft when they are rcleased. The boss orextension 22 is also adapted oto engage a shoulder on the eccentric, itbeingnormally held in engagement therewith by the spring 21.

The cam plate 23 is provided with an aperture comprising a centraloblong portion having parallel sides corresponding to and fitting thelocally flattened or slotted sides of the shaft 7 and also a circularportion joining the oblong portion at one end.I

the circular portion being of substantially the same diameter as themain portion of the shaft. In applying the cam plate to the shaft, theshaft is lirst inserted longi4 tudnally inthe circular portion of theape-rture and is then moved laterally so that the slotted or flattenedportion thereof occupies the oblong `portion of the aperture, whereupona circular plug or key 2G is inserted in the circular portion of theaperture and upset therein to secure the parts together.

The cam plate 23 carries a pawl 27 that 1s pivotally secured thereto andis provided with a pin' 28 that engages the edges of the eccentric 20,the pin and the pawl being actuated by the said eccentric. The pawl 2Tengages a ratchet 29 that is rigidly secured to the post 5 and therebynormally serves to lock the shaft in position. However, when it israised by the rotation of the eccentric 2O until it disengages the teethof the ratchet, the cam plate 23 and the shaft with the bridging member8, are rapidly driven forward by the spring 21 through the angulardistance between the rteethy on the ratchet. As the said parts aredriven forward the eccentric serves to move the pawl invvhrdly and tocause it to engage the next tooth on the ratchet 29, the movement being,in this fanner, suddenly stopped and the parts be# ing again locked inposition. Thus, it is seen, that the pushing in of the button 13 movesthe lever 12 ,and the pawl 'l5 .so as to advance the ratchet 18 and theeccentric 20 and thereby Wind up the spring 2l. When ythe eccentric hasbeen sufficiently advanced,

the pawl 27 is thereby raised out of engagement with the ratchet 29, andthe shaft and its attached parts are rapidly carried for- Ward, thebridging member 8 being caused to rapidly engage or disengage thestationary terminals, as the case may be.

For the purpose or indicatnuT upon the avec exterior ofthe switch, thepositions of the bridging .member 8, the plate 2 is provided with asecond aperture behind which a movable indicator plate SO is mounted,therear face of the plate being slightly recessed for the receptionthereof. In Figs. i and 5 the indicator plate is reciprocablc and isnormally maintained in the position shown by a spring 3l. lt is providedupon its rear face with a projection or boss 32 that is interposed inthe path of movement of the ends of the cam plate 23, which are adaptedto move the indicator plate to its other p osition, and to retain itthere, 'against the opposition of the spring 31. When the cam plate ismoved to the position shown, the indicator plate is moved by the spring31 to the position shown. As the indicator plate is mounted separatelyfrom the switch parts, and is not rigidly secured thereto, there are nofastening devices therefor to be severed orV deranged by the quickmovements and sudden stops of the switch parts, and the indicatingmechanism is consequently strong, durable andreliable.v Also, since itis ac- ,tuated by simple extensions of the cam plate, ,which require noadditional space longitudinally of the shaft, a very compact structureis provided.

In Figs. 6 and 7 a' modified form ofthe indicator is shown, theindicator plate 33 being circular and adapted to rotate rather than toreciprocate. In this case the cam plate `23 is provided with an armcorrespendingto each position of the switch. The positions of theindicator plate 33 are accentuated by the provision of recesses in itsedge and a resilient pawl 34 that bears upon its edge and is adapted toenter the recesses.

` l claim as my invention 1. An electrical switch comprising a shaft,

a contact blade carried thereby, a stationary ratchet, a pawl carried bythe shaft and adapted to engage with the said ratchet, a second ratchetloosely mounted on the shaft, a cam actuated by the said second ratchetand controlling the said pawl, resilient means interposed between theshaft and the `vsaid cam and acting to maintain them in anormal relationto each other, a pawl engaging the said second ratchet, an actuatinglever that is fulcrumed eccentrically with respect to the shaft andcarries the latter pawl,` and a single spring for maintaining the latterpawl in engagement with the said second ratchet and for returning the,actuating moer/49 and controlling the said pawl, resilient meansinterposed between the shaft and the said cam and acting to maintainthem in a normalrelation to each other, a pawl engaging the said secondratchet, an actuating lever that is fulcrumed eccentrically with respectto the shaft and carries the latter pawl, and means for maintaining thelatter pawl in engag ,ment with the said second ratchet and forreturning the actuating lever to its initial 10 position,

In testimony whereof, I have hereunto subscribed my naine this 27 th dayof March,

ALLEN A. TIR-BILL. Witnesses R. E. CULLINGS, B. B. HINES.

